Cement lasting machine for use in the manufacture of shoes



Nov. 14, 1961 A. WEINSCHENK 3,003,157

CEMENT LASTING MACHINE FOR uss IN THE] MANUFACTURE OF SHOES 4Sheets-Sheet 1 Filed Sept. 24, 1958 Fla 1 iii Nov. 14, 1961 A.WEINSCHENK 3,008,157

CEMENT LASTING MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept.24, 1958 4 Sheets-Sheet Z VENTOQ: W W

ola 1 Nov. 14, 1961 A. WEINSCHENK 3, 0

CEMENT LASTING MACHINE FDR USE IN THE MANUFACTURE OF SHOES Filed Sept.24, 1958 4 sheets-sheet Is FIG. 3

INVENTOB. aim m AGQAXQECIT/ Nov. 14, 1961 A. WEINSCHENK 3,008,157

CEMENT LASTING MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept.24, 1958 4 Sheets-Sheet 4 /Nl ENTO/2.' g I I g Uniterf. iitates Myinvention relates to cement lasting machines used in the manufacture ofshoes for pulling over and lasting the vamp or upper. Such cementlasting machines are being used to avoid the use of tacks and tosimplify the said pulling over and lasting operation. In such machinesthe upper is drawn over the last by means of pincers and thereafterlasted by means of wipers, the edge of the upper having been inwardlyreversed by means of said wipers upon the inner sole placed on the lastand cemented thereto. During the operation of such machines a piling upof leather, more or less depending on the type of shoe to bemanufactured and on the kind of leather, occurs in theshank andconsequently arising wrinkles have to be eliminated manually bycumbrously pulling the leather obliquely forward toward the toe. Veryoften this necessitates tearing apart already cemented sections and thisresults in a great and costly waste of time.

Attempts have been made to eliminate the said disadvantage by installingspecial ball pincers. Such pincers, however, released the leather at thebeginning of the action of the wipers and thus did not prevent theslipping away of the upper in the direction of the shank and of the heelduring the lasting action of the wipers. For thisreason it has beenfurther suggested to use pivotable or retractable ball pincers, theirpivoting motionbeing dependent on the wipers or on the upper pulledinward by these wipers; However even such ball pincers did not, at leastnot satisfactorily, prevent the slipping away of the upper in thedirection of the heel and of the shank.

It is an object of my invention to eliminate the above mentioneddisadvantages and to prevent the piling up of the leather in the shankand the slipping away of the leather in the direction of the shank.Moreover, my new machine permits applying immediately preceding thelasting of the upper an independent pull to the ball section in thedirection of the toe, experience having shown that it is advantageous,in order to obtain a perfect lasting allowance free of wrinkles, to pullthe edge of the upper in the ball section obliquely forward in thedirection of the toe;

According to my invention the cement lasting machine has independentlycontrollable ball pincers, which canbe pivoted not only in the directiontoward the longitudinal axis of the last but also in the direction ofthe toe. These ballpincers ar'e put into operation after the actualpulling over operation and the subsequently following correctiveadjustment of the upper are completed; they pullthe edge of the upperobliquely forward by their pivoting motions both inward and in thedirection of the toe; before the wipers begin to operate, whereupon thelasting is enacted. In'this respect it is important that the release ofthe upper occurs only then, when a displacement of the leather in thedirection of the shank and/ or of the heel by the ac tion of the wipersis no more possible. For this-purpose the ball pincers are controlled independence upon the path of the wipers, e'xpediently through the'wiperpiston, arid the" control of the opening of the ball pincersisadj'ustable byregulating means in accordance with the existingconditions.

The said and other objects of my invention will be more fully understoodfrom the following specification when read with the accompanyingdrawings in which one ate t ice 2 embodiment of my new cement lastingmachine is illustrated,

In the drawing- FIG. 1 shows infront elevation the arrangement of ballpincers with the upper pulled over the last and held securely by thepincers;

FIG; 2 shows a side elevation of the ball pincers in starting positionaswellas a side view of the valve mechanism for switching the pincers;

FIG. 3 shows a top view of the arrangement of the ball pincers aftertheir pivoting movement in the direction of the center axis and of thetoe of the shoe; the control mechanism of the device for disconnectingthe pincers;

FIG. 4 shows sectional views of the pivoting support of the pincercarriers 12 with slide piston 16.

The same reference numbers indicate the same parts in all figures of thedrawing.

The shoe last is designated by 1, the upper by 2, the inner sole by 3,-the last carrier by 4, the crimping wipers by 5, the side pincers by 6,and the toe pincers by 7'. A slidable support 8 provided withlongitudinal grooves serves for the positioning and adjustment of theball pincers 2627 in the direction of the length of the shoe in therequired relation to the side pincers 6 and to the given length of sizeof the last. Two hexagonal clamp bolts 9 lock the slidable support 8 onthe supporting trestle 10. This slidable support 8 is equipped with abed bolt 11,- which serves as a seat for the pivoting support 12 of thepincers carrier. A retaining ring 1-3- assures the blocking of saidsupport 12 invertical direction. This pivoting support 12 houses thepivoting bolt 14 for the piston housing 15;, and also the slide piston16*, which,- when acted upon by pressure oil supplied through pipe 65,initiates the pivoting movement of the pincers in-the di{ rection of thetoe; the hooked end portion of the slide 8 serving as a counterstop(FIG. 4-).

The pressure'spring 19 returns the pivoting support 12 of the pincerscarrier together with the entire pincers mechanism after each operationinto its initial position sectionA B in FIG. 4). The casing 17 tor thepressure spring 19 is fastened to the" slide 8 by means of bolts 18(FIG. 1). The position of the bed bolt 11 is so selected that afavorable operation of the pivoting movement of the pincers with theupper leather is attained (see FIGS. 3 and 4).

Such pivoting movement-in the direction of the center axis of the shoeis effected by the piston 20 which is slidably mounted in the pistonhousing 15' and acted upon by pressure oil supplied through piping 64.The desired adjustment of the p-iv'otingmovementof piston housing 15is'eifected by a stop screw 21 restoring spring 22 which returns thepiston housing 15 into its initialposition aftereach' operation; anda'block spring 2.3which prevents an independent displacement of thestops'crew 21 which is screwed-for adjustment into the support 12;. A'regulating screw 24 mounted inthe piston housing-15 permits anadjustment of the initial position of the pincers relative to the" shoelast.

The-pincers support 25% serves as a seat for the ball pincers which arecomposed of the lower grasping jaw 26 and the upper graspin'g jaw 27';=the'='lower jaw 26- is swingably mounted on a shaft bolt 28 whereas"the upper jaw 27' of. thepincers is permanently connected with thepincers support 25by means of positioning pins 31*. A? piston 29'reciprocable insup-port 25 is actuated by pres+ sure oil supplied bypipe 66* and closes atthe required moment theball pincers 26, 27. Arestoring spring 30 returns after each operation the pivotable lowerpincer 26 into its low position, thus permitting the insertion ofanother piece of upper. Another restoring spring 32 returns the piston29 into its initial position, after the pressure oil is shut olf. 'Ihepincer support 25' can be easily adjusted on or detached from theconnecting shaft 33 by means of a locking handle 36. The shaft 33 isalso adjustably mounted in the piston housing 15, in order to permit itselevational adjustment relative to the 'lower edge of the crimpingwipers 5. As shown a guide bolt 34 is bolted on shaft 33 and moves in aguide groove located in the piston housing 15 thus preventing arotational movement of shaft33. After the pincers support 25 has beenelevationally adjusted the same is blocked in the desired position bythe pair of retaining rings 35 which are adjustably mounted for examplescrewed on the shown (FIG. 1) sleevelike extension of the piston housing15 and between which the bolt 34 may be arrested.

A valve mechanism controlling the pincers serves for the release of theleather held by the ball pincers at the appropriate moment (FIG. 2). Avalve 40 for the control of the pincers is attached by screws 41 on themachine frame 42. A control piston 43 in the valve 40 is kept in itsinitial position by pressure spring 44 in such a way that the pressureoil can flow through the pipe 66 to the ball pincers (see FIG. 1). Aretaining ring 45 serves as the upper stop-guard, while the cover 46 ofthe valve 46) serves as a counterstop. When the control piston 43 ispressed down into its low position, the pressure oil supply in the pipe66 leading to the ball pincers is disconnectcd and the oil flows intothe return pipe 67; this causes the ball pincers to open and to releasethe leather for the lasting operation by means of wipers 5. On thepiston 47 actuating the wipers is permanently mounted a control flange48 by means of a positioning pin 49 (see FIG. 3). Furthermore, a guiderail 50 is fastened to said flange 48 by means of screws 51 and it movesin the groove 52 of the flange. The rail 50 serves at the same time as aseat for the carrier 53 of the cam roller 54. A pivot bolt 55 isfastened on the machine frame 42. On said bolt 55 is situated a camlever 56 with the adjustable cam segment 57, the positioning pins 58 andthe regulating screw 59. When the movement to close the wipers isstarted by the wiper piston 47, then the roller '4 presses the camsegment sooner or later, depending on the adjustment, and this segmentpresses in turn the control piston 43 into the low position anddisconnects thus the pressure oil pipe 66, so that the ball pincers 26are opened. Segment 60, connecting lever 61, wipers carrier 62, camrollers 63 and wipers 5 participate in the movement to close the wipers.

The machine operates as follows: The upper 2 drawn over the last 1 isinserted in the usual manner into the pincers 6 and 7. Then the machineis actuated for example by a foot pedal. Thereafter the above mentionedhydraulic control is actuated, pressure oil from pipe 66 acts uponpiston 29 and the pincers 6, 7 grasp the upper and close; thereafter theupper is pulled over the last and placed tightly thereon. The machinecomes to a standstill and the upper leather can be correctively adjustedon the last.

A further pressing on the foot pedal initiates the second phase. Theball pincers 26, 27 are pivoted by the control piston 20, to whichpressure oil is delivered through the pipe 64, in the direction of thecenter axis of the shoe and shortly thereafter the pressure oil pipe 65receives also oil whereupon the ball pincers 26, 27 are pivoted in thedirection of the toe of the shoe by the control piston 16. Thereby thelasted portion of the upper is drawn in the direction of the toe and isheld securely. The following closing movement of the wipers through theaction of the wipers piston 47, segment 60, connecting lever 61, wiperscarrier 62 which is controlled by the rolls 63, and wipers 5 bring aboutthe lasting of the upper leather on the inner sole in the cementingprocess, which is done in the conventional manner. During this lastingoperation, depending on the position of the segment 57 of the cam, whichis aligned by means of the regulating screw 59, this segment 57 and thelever 56, respectively, press the control piston 43 into low positionand the ball pincers are opened, so that a displacement of the upper inthe shank is prevented. The toe pincers 7 and side pincers 6 havereleased their hold already at the beginning of the lasting operation,by means of another valve, not illustrated in the drawing, and operatingindependently from the above described steps.

It is essential for this invention that the ball pincers are controlledindependently, as explained above. It is also important that thepivoting'movements precede immediately the closing movement of thewipers. Moreover, a special device for the opening of the pincers mustbe provided for, so that the upper is released only then, when thewipers 5 have taken hold of it, so that it cannot slip away in theshank. Another new and useful feature of this invention is thepossibility to adjust the height of the pincers carrier, and by thisalso of the pincers 26, 27, in relation to the lower edge of the wipers,enabling to regulate the stretch of the leather, depending on the kindof leather and the type of the shoe. It will be well understood that themachine can also be operated by a purely mechanical or electricalcontrol.

What I claim as my invention is:

1. In a cement lasting machine for pulling over and lasting an upper inthe manufacture of shoes, the improvement comprising in combination apair of cooperating wipers; means to actuate said Wipers; independentlycontrollable ball pincers pivotable about a horizontal shaft in adirection towards the longitudinal axis of the shoe as well as about avertical shaft in the direction of the toe; said ball pincers beingadditionally elevationally adjustable relative to the lower edge of thewipers; means effecting such adjustment; and control means influenced bysaid actuating means for the wipers to control the opening movement ofthe ball pincers in dependence of the wiper action.

2. A cement lasting machine according to claim 1 comprising anelevationally adjustable shaft supporting each ball pincers and theiractuating means.

3. A cement lasting machine according to claim 2 comprising a housingfor said shaft; hydraulic means acting upon said shaft; said housingpivotably mounted on the horizontal shaft for the ball pincers; and setscrews to adjust and control the pivoting movement of said housing.

4. A cement lasting machine according to claim 3 comprising a pivotingsupport for said housing and its shaft; said pivoting support pivotablymounted on the vertical shaft; and a hydraulically operated piston insaid pivoting support effecting the pivoting movement of the ballpincers in the direction of the toe.

5. A cement lasting machine according to claim 4 comprising a restoringspring acting upon said pivoting support returning the same into itsnormal position. 6. A cement lasting machine according to claim 4comprising a slidable support shiftable parallel to the longitudinalaxis of the shoe and supporting said pivoting support and its shaft;said slidable support permitting an adjustment of the ball pincersmechanism in conformity with the size of the last and with the sidepincers.

7. A cement lasting machine according to claim 1 comprising actuatingmeans for the ball pincers independently and automatically operatingpreceding the lasting operation.

References Cited in the file of this patent UNITED STATES PATENTS

